Speed transformer



Sgpt. 1, 1936. CHEYNE 2,053,130

' SPEED TRANSFORMER Filed July 11, 1934 4 Sheets-Sheet l FIG. 1

m I I N VEN TOR.

FRE H. CHEYNE W ATTORNEY.

S 1935 F. H. CHEYNE a 2,

' SPEED TRANSFORMER Filed July 11, 1954 v 4 Sheets-Sheet :2

I N VEN TOR.

FRED H. CHEYNE I A TTORNE Y.

Sept. 1, 1936. F. H. CHEYNE SPEED TRANSFORMER Filed July 11, 1954 4 Shets$heet 3 INVENTOR! FRED H. CHEYNE A TORNEY.

F. H. CHEYNE SPEED TRANSFORMER Sept. 1, 1936.

Filed July 11, 1934 4 Sheets-Sheet 4 FRED H. CHEYNE ATTORNEY.

Patented Sept. 1, 1936 v T D ATE.s;

PATENT orgies 1 Thayinventioniisa speed" transformer, especially;-

adapted to; the; extreme; gearingdown: or: rotary:- motionyand; the invention; resides: substantially" in, the construction; combination. and arranger mentof element'sihereinafter; pointed outandire cited more particularly in: therclaims;

:It is; a, primary object: Of thfi; inventiomtopro vide-a meanszfor, transmitting motion from-the, Ifotaryrshaftjof: a. prime: mover to a eo-axiallyl aligned shaft-at any desiredilower' speed thanithe; speed of the prime mover. 1

It aifurtherj primary-object tot provide a device; of this'class: which iSzSElf-IOCkiIlg; and which; cannot. rotate or be rotated except; by; motion; transmittedfrolnirthe power receiving end; of the;

device; i

Itisa further object: toprovide a. device or this class which. may! be readily cbnvertjedi 110:3;1'13' ordinary speed: reduction, mechanism as:- desired;v 2g) Theabeve and other objects are. attained by the mechanisms: illustrated inutheaccompanying,

drawings in which:

:Figur'e-il iszazfragmentary elevation andipartly at longitudinal: section of: the device embodieda unitarily with an: electric: motor;

: Fig; 2-:is.a cross-section takenin thezproximity" ofz line *33 ofFigilrel; .7 Y Fig. 3i-zis a cross-section'taken in:the proximity; of lineifie-fl of'Figure 1; Fig; 4: is a fragmentary-view of; the: device,

drawni to a considerably smaller scale, and is: showndn' use as: a traveling self'i-locking hoist;

and;

Fig; 5 is-a fragmentarysection similarato'Fig 3,5; ure 1; and illustratesa: converted: form of the invention.

i Similar charactersiof reference designate similar partsathroughoutzthe different views.

4 The numeral I designates a cylindrical" enclo-isurefor-the gearing, one end of'said enclosure co-joining the housing; 2 of the electric motor 3 and-t'he :other: end :being. closed byv the: journaling head: 4 the apparatus as an entirety b-eing sup-- port'ed'by feet 5 formed: onthemotor end" of the: 4.5- enclosure' I and corresponding-feet, fiformed on" said: journaling heady: The gear'end of thedrive shaft T- of said motor is journaled through the w eb 8: which issformed acrossthe motor end of the enclosure I, the bearing 9 being provided -to- 50; receive said shaft. Said shaft extends'through said enclosure-almost to-the' head i, the extreme gear endf of said-shaft being journaled to the inner end 'oFthe-output shaft l0 by' -the beariri'g- H; saidoutputshaft'beingjournaled thr'oughthe: 55; head l bythebear-ing'l 2'-which i's embodiedin said;-

head; Said output 'shaft extends beyond the journal I'Zgexteriorly' of the device as'an entirety, the exposed end thereof being conveniently-pro vid'ed with the d riving pulley I3. I

The-sun gear i4 is a spur-gear concentricallymounted onthesh'aft 1 at a substantially central position of the casei and inthis example of the invention is integral with-shaft Said sun gear-meshes with the planetary gear l5 which is mounted on the planetary shaft l t and which is conveniently locked from independent rotati'o-n b'ythe key IT. 3 1

The hub iii of the carrier wheel i 9; is journaled at'e'ach end on the shaft 7, through the-bearings 2B, which are disposed on said shaft on opposite sides of the gear i l, the inner or motor end ofsaidhubbeing spacedfrom the web 8-; Said carrier wheel is dually formed fromone side of said hub and provides the two parallel half-discs bland 2 2 between which th planetary spur gear i5 is disposed in meshedrelationwith the sun gear' M, said planetary gear being mounted upon the-planetary shaft it which is journaled through the half-discs and 22 by the bearings 23 and 24, respectively, by which arrangement it will 5:

be 'understoodthat said pl'anet'ary gear is rotatable by the motor 3, through the 'motor shaft- 'land sun gear l4. I The-endS of the planetary shaft 15' extend beyond the bearings-23 and 24, respectively, the 0 crawl gear 25-- and} the driving pinion gear 26, being mounted ondifierent ends of said shaft beyond thehalf-discS-Z-i and2'2, respectively; the crawl-gear 25 being secured to said shaft similarly -to' the planetary gear IB, and the gear 26 in said disc and is securedtherein by theUpinsSZ.

The stationary. internal gear: 21 and the rotatable internal gear at, are concentrically: positioned in relation to the motor shaft "Land. said rotatable internal gear is rotatable with the shaft I0 and disc 29l v The-total number'ofteeth onzthegear 25iand gear 21, is greater than the totalnumber of.teeth on-gear 26 andfthegear 3i), consequently the gear 39' will' advance each revolution of the carrier wheel: i9: afraction ofrone revolution, said frac;- 5

' per minute.

" output end. Assuming that power were applied tion being determined by the difference in fractional ratio between the gear and the gear 21 as related to the fractional ratio between the gear 26 and the gear 30.

In the example shown the speed of the motor shaft I is 1725 revolutions per minute, the sun gear I4 has eighteen teeth and the planetary gear I5 has forty-eight teeth. The crawl gear 25 has fifteen teeth and the fixed internal gear 21 has seventy teeth. The carrier wheel I9 will therefore be pulled around by said crawlgear in its engagement with said fixed internal gear, the fractional number of 1725 revolutions per minute determined by the ratio of the planetary gear I5 to the sun gear I4 multiplied by the ratio of the M crawl gear 25 to the fixed internal gear 21; being 138.616 times per minute.

During one cycle movement of the carrier wheel I9 through its orbit about the axial center of the shaft the crawl gear 25 is revolved in the fixed internal gear 21, 4.666 times, and the planetary driving gear 26 being revolved a corresponding number of times and having fourteen teeth works 65.24 teeth of the rotatable internal gear 36 which has sixty-nine teeth, therefore leaving 3.76 teeth unworked during each revolution of said carrier wheel, which will cause the internal rotatable gear 30 to advance 3.76 teeth each revolution of the crawl gear 25 through its orbit. The output shaft. I0 is therefore revolved 7.366 revolutions If the motor 3 is stopped intentionally or other- Wise, the output shaft I6 is self locked in any position. For example in. embodying the device With a hoisting drum means 33 which is directly driven by the output shaft II), as in Fig. 5, the

motor may stop or be stopped at any stage during the lifting of any weight such as the automobile 34.

The device is self-locking as considered at the at the drum or pulley I3 in the reverse direction as considered in Figure 1, it would tend to revolve the rotatable internal gear 36 counter clockwise as considered in Fig. 4=. This wouldvtencl to revolve the planetary driving gear 26 also in a counter clockwise direction; which would cause the carrier wheel I9 to rotate also in counterclockwise direction about the shaft 1. But since the crawl gear 25 would likewise rotate in a counter clockwise direction about the shaft I6 it would tend to pull the inner end of the shaft I6 in a clockwise orbit or reverse direction from the outer end, due to the fact that the fixed internal gear 21 is stationary. It will be obvious that when rotative force is applied to the output shaft I6 in a clockwise direction as considered in Fig. 4, the crawl gear 25, by engagement with the fixed internal gear 21, tends to pull the inner end of the shaft I6 around counter-clockwise in its orbit and opposite to the tended orbit movement of the driving gear 26. Thus it is obvious that the engaging teeth, of the crawl gear 25 and the fixed internal gear 21, and the engaging teeth of the planetary driving gear 26 and the rotatable internal gear 36 act as a key to lock the device in either direction at the output end.

The carrier wheel I9 is centrifugally balanced together with planetary shaft I6, the planetary gear I 5, the crawl gear 25, and the driving pinion 26, thus providing an eflicient, quiet and steady running mechanism.

In constructing the invention for a rotary direction reversing device as well as a reduction means the total number of teeth of the rotatable direction opposite the rotation of said carrier wheel.

It will be obvious that in substituting slightly different sets of gears for the sets illustrated that widely different ratios of reduction are attained. -The invention is converted to a device of more 7 ordinary speed reduction by constructing same without the fixed internal gear 21 or crawl gear 25, the dowel being threaded through the corresponding hole 36, in the wall structure of enclosure I, into engagement with the dowel hole 31, in the carrier wheel I9, under which usage a simple speed reduction is attained from the motor shaft I through the sun gear I4, the planetary gear I5, the pinion gear 26, and the rotatable internal gear 3Il, the carrier wheel being held from' sets-of gears of the sameaxial spacing. In otherv words thedistance from the axial center of the crawl gear 25 to the axial center of the station-v ary internal gear 21 is identical with the distance between the axial center of the planetary gear I5 to the axial center of the sun gear I4, as well as the distance from the axial center of the driving pinion 26 to the axial center of the rotatable internal gear 30.

It will be obvious that the invention may be constructed with two or more planetary shafts I6, journaled through the half discs 2| and 22, each planetary shaft having acrawl gear 25 meshing with the fixed internal gear 21 and a planetary gear 26 meshing with the rotatable gear 36, all of said planetary shafts operating in unison.

An important feature of the invention resides in the fact that by substituting gears of different ratio for theplanetary gear 26 and rotatable gear 36, and/or fixed internal gear 2! and crawl gear 25the ratio of reduction in speed between the motor shaft '1 and the. output shaft I0 may be changed as desired.

- With the object in view of providinga quiet and smooth running device the carrier wheel I9 with the planetary gear I5, the shaft I6, crawl gear 25, and planetary pinion 26, are together constructed as a centrifugally operating unit.

. While the description and drawings illustrate in a general way a certain manner of carrying the invention into effect, it is obvious that many modifications may be made in the various details without departing from the scope of the appended claims, it being understood that the invention is not restricted to the particular example herein shown.

The invention claimed is: v

1. A speed transformer comprising a rotary power receiving shaft, a carrier wheel pivoted coaxially with said shaft, a'sun gear carried on said shaft in operating position, a planetary shaft pivoted through, said carrier wheel parallel to said power receiving shaft, a planetary gear mounted on said planetary shaft in meshed relation with said sun gear, a crawl gear mounted on said planetary shaft, a fixed removable gear concentrically mounted with regard to said power receiving shaft, said fixedgearbeing in meshed relation with said crawl gear, a driving gear on said planetary shaft, a rotatable gear in meshed relation with said other gear, said rotatable gear being connected to a power output means, and a means to lock said carrier wheel against rotation when said fixed gear is removed, said means to lock causing rotation of said rotatable gear through said sun gear, said planetary gear and said driving gear.

2. A speed transformer comprising a rotary power receiving shaft, a carrier wheel pivoted coaxially with said shaft, a sun gear carried on said shaft in operating position, a planetary shaft pivoted through said carrier wheel parallel to said power receiving shaft, a planetary gear mounted on said planetaryshaft in meshed relation withsaid sun gear, a crawl gear mounted on said planetary shaft, a fixed gear concentrically mounted with regard to said power receiving shaft, said fixed gear being in meshed relation with said crawl gear, a driving gear removably mounted on said planetary shaft, a rotatable gear in meshed relation with said other gear, said rotatable gear being removably connected to a power output means; whereby gears of other size may be substituted for said rotatable gear and said driving gear in changing the reduction ratio of the trans former.

FRED I-I. CHEYNE. 

